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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef3afe3066c5e110ab474533a4271b80c77358a9fb16ab5ce343a0cf918ac1e' 
  AND token = '7IxSAUj4rn6JuLG+H9/swkoYEI5sNzRQSqNCh78Zw54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}