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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34fbeee9f26f4502c17061f17693878f942540e4014db3462a69b0d1e7824b7' 
  AND token = 'h+NiVbIHzW9+PivFLishS+edb0elTVvdzkodTnC0NI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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