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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ff3e159ce669682ec8b7772cd456c236548526397f10756a9e8e443798a5b1' 
  AND token = '6cTJajWwO43A7yT2Rq5RNjwr1SYO+zR/xMAYSJ+RXJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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