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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3300489a19c6a5ecf404d8b67aabca2b0031120bb5ab9ad90bc54f71f3cf0248' 
  AND token = '9BbLX9Ci8595ywUVuOILli8EJCReVDnGR97Xns5VnpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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