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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d758a0839a32ba86728178485b9d897bf05c6e7b9b5bb98aa8d82fe2304999b' 
  AND token = 'z7Cs4YWVuZLic+cgPdhA60fI1paLMNN9u2yxVDde5Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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