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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79639dc3e9476cbd136d3f75f1ff11794a03c8f6a5b006662fa714e573d9a676' 
  AND token = 'JG0RYN46oot3xoUJc21AIWxbNupp5fk+Y/CPhpIw0s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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