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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab953baade7890906acb5f88b357b04ae399f605b15164ddb5c7252f82a4df2c' 
  AND token = 'm3vEDQrjuWiErkEESdTAhrhtzXADpADCSEHdgnXtFS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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