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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4bf429d54cc65b282dcc6d10a2c2fd7622d08a049caf8bdea2099208034f30' 
  AND token = 'FFtg0slEXekcZDL48Smjb8Un63uVYruCvBhbahuF308=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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