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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55911577c322ad7d56b92a4bf7b7ad843fac326ddebf0219dcd80fa6c48da514' 
  AND token = 'ESFxcktoyZLjY73rj4ER7XrUQmo0mJLigYh0oobV1WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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