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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8260db1b89dca6a59d4dd17c4e68e2cc6eee863a8e8b8764f300bd93e32ddf94' 
  AND token = 'yyX9/8JTwFO+6T+jfRxurW+HqgQxQAkydJv1ghtrJ4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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