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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2505ca071f8fa45538bb82734a8551358fe58e889eaee30862dcd93896b39d7' 
  AND token = 'nl56BSGA7JlZIUY9lG+T6NKPlqdxpKc4DACbGldID3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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