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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae14cf87f52a385d09970ee5b308aae7591078df27f5319b149703fa40cf71ae' 
  AND token = 'uDa/S8rcD+i3QKRyZR3pLFL1Qvq5YsCx8IOwotNSM7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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