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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcb8105d27fb9ad434c1ba27f4e3fcf59ede5c186efd2d224eb811c66994fee' 
  AND token = 'xJ66ZTTQvFJpiK4LUT0lPaeRU477F+BbvaqmtoQ5po0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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