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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c9ca5b7d82bda78e4e51ebb0af5b7a348d68a873c1a44b524e592ab3665671' 
  AND token = 'mHHU27/Xv1TthFGEddEPwF6RJfTXaif7mLrhy3JVqIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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