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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd227edb79a81af609766b940eb4b5f76391c16c4961415da21e7ed495f87d5' 
  AND token = 'hd5B4vMWrQ+omQOTOxS7rPbTONA5e1YSGQOSjS2NJWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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