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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff87dc48b47670d51148c39857c924e745ee79abb92807d4f45b9d0bfc0af7f' 
  AND token = 'BGNgKQl31lbzvkTL8SzePyTooPL5LABkTt+fWJadi5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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