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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbde348bdc672d3501d8fced7a64954bbbe0dbe0276d356db5e5ad5bebcf877' 
  AND token = 'or7wsDCQ5ms72GpVhQo0z1TgIaIhIE6Hhitu7g6dG9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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