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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0c32fcfd40001c058b9adb4bf999b5c78c788b220764336cda8f84a9ccec48' 
  AND token = '5+oDT/GX3uEmtVgpnz+RTqzOI+qT5K4dmLnBrUGfL+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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