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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b71fc3ee4f4a876d0f0c342ba346328ff0b99052df26f30b0fb39c897c8104' 
  AND token = 'gIsFgTsJP6vQ279APbS7/AJxFt/3vLQ/JE3tEyw0EEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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