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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8c1b4617f5f260a1357987b472c6d7697565505b4105bc62c65ba7b21dbbf6' 
  AND token = 'QMAHQX1M31ig12tLxkhhUy/Qlr3JUC1yaL8yEObhlWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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