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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c543368198f5d2d6075998719f06ccd53955edcf95e7f924ecd60a20b60fc4' 
  AND token = 'aKRpunruk4zXBa1PlwX1ES8Q89aNNwda8VoTUHLgtDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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