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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363986c038b193736171c40a692d851ba8441de531f0de023e4763f503e35757' 
  AND token = 'gsrm9sXhGdN5zReHewK+AoA22tw5+OqJK7EK9smz1fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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