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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a4127cfbb7364c284879abc567aeb7f0ac3d6f8887e9f9415d4fb93b284901' 
  AND token = 'd4rkTXzn7mUYppzatjIhBzslf4s23G8Lg7oUe04dbHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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