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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bcf65a092b8300dc9d3cc6ac66942752fb9673699e2c15c41e4be1d5b69bfc' 
  AND token = 'QrBVzgdCcE1SGIO5Pk/6hS1j+hrsHtuLQxoiOO9vh48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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