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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83213655bdfebac0b5bfb4b347d6af8050a21ad6899975a6092a2265059372ef' 
  AND token = 'Vju44ygNg9KePEaJo8SuKnFRiHFN4opCSVVecOArsQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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