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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63c5ac4a772038b7be23aabeb5b07ad22218a05da9e3120790e54868caf4cfa' 
  AND token = 'PMZggR6ym2DRuDrpTHgVz5lgepmn1nbVUZRn5ZzegJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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