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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a0c7d2be633e5a447f6b366b774496108ff1b67a89e1cc25381bbabd63d25f' 
  AND token = '2coBCsk2IVNHcN2rkXOxCb7KhCdyS6d717XH0D/LwVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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