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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfae85690d7aabe334a9369faee9c85973945a26cb7432d2c11b58ba5b7ebca' 
  AND token = 'VAIV+GK5slgTDa15mbb13NKv2/5zelLsct1byKtvV/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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