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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e4eddd7de4e8d3b0dee3bdf0c4e94cc80bfba0b66bf6b827477902cc9c5b09' 
  AND token = 'k9Ifk4qcC8fkBUJTdCO7Wef0CFuvkGqBdo/x0nc29t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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