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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fed683000d48fc88c3805186c450d3b1c33f76d1f161f8fd75f72af0aede7f' 
  AND token = '/4wkIqxTS7fVlIhNijK/DvZo/oa2V+lQ2j851plIrjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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