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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c76b257570723fc4009ad80d7e268d3726485c1a2304bba20128ba779ccd47' 
  AND token = 'J+nT0CAoRib3TDbGXbdKX7bU88GM53hqlndxYNhtCPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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