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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a54da356a915b045c1d6e008e690c450833966ca5f624f785f954b099368fa' 
  AND token = 'l6GFrVQCuLqryEucdBB4jUxI5y0ikil/1cM5YUynSxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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