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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daff6c2f0039a982ffba787a1d4244c9b18e36f1562c8e172c8a68312fdb09c7' 
  AND token = 'rO79hBAUVbb9PdvxXl3o4TQolIE1AISRXR7KfVaeBkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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