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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb13dfebfcaaf5b62284417e0892c3b81106b1d3ebd55cf5563d0cbcce27e4b1' 
  AND token = '5WL7AOGOm+Ulqll/dNoiZZIiYEJaWvxOV4IWuqB2iiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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