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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217da38fd57977e9b53dfa7406c5e002177516c46bc356c7443dcb2d4d95da03' 
  AND token = 'ELQ/wuGNOj8LzNEg7Zw/QRSh/K/5giOui0rZgN3I3zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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