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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537d28d1962de69d36c20c86ae0dba1a010fe8102db1349310d34d8fa6617b92' 
  AND token = 'Yc6Wk54XDEqddNylxysZeueegH262W0SyLa5fmO6D+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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