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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af8e590e28237f9dcd6236924ad601fe6f9424da0584540d33962c30c3ea318' 
  AND token = 'GelNRyJeSeyJG2S7HB9UpYAAtkrjVrA2XsFC5OEQTgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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