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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21dd69e1ffb30c3032d4f758fbdc343f73246c51a9cdd2ccfacabd8b89c1d13a' 
  AND token = 'WdKfshk9IEBlgA7XWwkXEtQgvv6/5Trz276rfp+7vps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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