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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9217c83fa6caf32a9c67caf6b16779f567448f3043e7e03adc4e71b06b02b98' 
  AND token = '5t8hGgeZsTpIsfF3eFq5Ueipae2tMX9SjGVwxz64qvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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