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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fde41ae60c97608884da63880bfbaafc17f37fae771c9af8f500981c6c9dc7' 
  AND token = 'fz/l6sHM1gwO6VfguucPAdRsSvgRE9pQp9Whz2xJRoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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