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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e32b0b6ba6f0698af48e61c20418a636c7f1c465a245ed8b04d965d2ee178cc' 
  AND token = 'lfv5H4gKnvme+T5rneyWT+hHBbe1dmUNXEPl1K+WWHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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