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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda86fb9f7b141d726a52cb7c8b6d251b504979cb6201fa0632aff5b4f911fbc' 
  AND token = '+4ugimOgw6/UUX0lmymh0DctCa+Lkdez4zUpQtbFl6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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