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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca07d8a805f808c0208ff0cf2c16ba7b33f601f997a113c9b9d0d475b98fbf5' 
  AND token = 'LijBUO0s9on2rUE0tlg2nhWz9u7EsAfR5kK3Xv6belQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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