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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689b047c4a1c5dd1a08051fe2fdb9435757df406e3c35251e33901cb96ab5060' 
  AND token = 'GYeO6vTTxTcTBXp9wI6ANKapRWBl6sziPBpp28ZCNF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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