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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a66bad18eee97f2b811fdf609d871c5374efee8c2c49d7fb43bba37b5f8ccb' 
  AND token = 'eld5GfOGWZ7sg6qD5jgXQfJ2wZA5wZPjOXD8jbODKI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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