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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8616ebf5351736255b8a977f46f4f8162659073776d51d5c9c0a63198f13d382' 
  AND token = '1U2WZ5Ren6oZcDx5CcX5V7jAsVaxo3maPw8HdaE5njU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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