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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89ac7847e6b7c72dd97348e75285d45e61b0535e8ac09b8fba6999c80ba7cff' 
  AND token = 'OTOgFag5dX6k6HLQMZpZeZMhpI3xqS8oPPkYVqjUvL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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