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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb30d5087a3c01233d73e6f57a7b9b69d259d6bbf04923a1906b9e956be75f38' 
  AND token = 'Quw+L9SPArOwi3KFpbfzfzClLt2YBkkqNDkIU1quDAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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