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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08665564d3918c32c5f7e4822c56705781218e50973df9ec55b98bc91313accc' 
  AND token = 'ePvTyJeYpBPPwC4kqy+06kcS1ZaaZAhxtouzf5OD7gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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