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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572744dd53dd870f28359a2cae6a63d0c6094f3ad0f2d18fabdda5c029ca6f68' 
  AND token = '3GCoEP3Q50QXT7jRPH4LTSkqQXc9ER3hO1NWBeY8Zdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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