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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f698cb0d6d2206355418a5104849c29ec1d955e604ea08fbe3af7463cf9c0ff0' 
  AND token = 'BGpZmSc2zKUFWEZwAMAv2DLX1eMN5DBN82ia75j8vR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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