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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '721c92ca70f6731bef9a3645b5115a0b4ce536e44d499608e85e196fb63f8282' 
  AND token = '+eXORAMdlx9bgg40M9KTJhOP/fkoJNlXhoDfRXGNgjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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