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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df02f4c02f621689950b77885413d3ca6fe492b63f4a1d09a3692f35ae43330' 
  AND token = 'on+ixM0rUE/oDtjvJSn/3tlnWf6D/8K5lkAtq6s7U/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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