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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2668fd1d828d776b1ae67c4677419b6f654c154bfdba216ebe7158a37f31a4' 
  AND token = 'l+/b5wqDTNw2cglGx/83ryNTRz7fjbTNNi0VhYn9I0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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