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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235885b3ff9b85d15d73cb03410b2beadd7c951aa0d57fc0a13bc15c6f16fcf7' 
  AND token = '8uetSqo5AxT9/L947x4Nnmz56ivnDuEOdstZDRQaA/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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