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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cfd3c2277d0fa4ca277922c71a5f250ecf350f67000b99fb45607d69854d9b' 
  AND token = 'h7mHkGJ6aufECBlyMCQI3SMdt0O9vAGVbgt+6US1VI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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