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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f532fe46945c08aafb206f6b55c35d7011126069a5c976c9922b4fd6cd9182e' 
  AND token = 'WdI3pWszTbhW+n5IuOn8YGhbo3/PAnJmn92JDP9+84E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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