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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1bb30ff1005d0b85eae952e6a8e9c635d072843c4327c722ab892ec4a7c28c' 
  AND token = 'jRnQXA5UeLBmffjQ4B7TTY9ILuf0mOBVEJD5wQWaxyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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