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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d9cd1d3b9f24b3b3c91497630a50f0c8eb84cc3fa8969ca4c27ff5bf7818de' 
  AND token = 'bcvQIexCMvXE/ecJfrlcxd6jW0rXcAkRCYrX7DfQytg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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