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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b526a54ca0ee631acd29bdfb7a9b5f68fc4c6294e3b1e5ba46c83246c0df63b' 
  AND token = 'JPK0WIjSgYGggQ5YpoPf2hX0KtzLrsnBI836KOf7Reg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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