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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82528126b66260886b4ff56c1c932db333abf201fc76abf0ee8f0614e4f15aef' 
  AND token = 'JhNUkpzRlK09Leo8LpKKfGTbnQNc3Etu3GX+vlEcP30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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