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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ad0e3108571fd8589d98dcc43af00409f83d020b7e6990b9b5a495f0c85ad3' 
  AND token = 'eccKntadNss8lVStNJ7mjL+gvEgeiW+g+OyMoz8N+ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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