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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ddd254932a05188a82d4e8e12f9ec93a829f05513c9564c3b1a6992db0cc97' 
  AND token = 'B4TNWlDDrd2t1ysU6YwI/EENciN74EPWDr4jsKip6QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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