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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5924b43957cf3cbd28c82cf71a2a1869fc925ea7e765a098b7238fba52cd864d' 
  AND token = '2jQi7I9hgWQ8Bu4TWCphOtvO51MYjNlvj4Ad4W4835g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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