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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbe3767ff647b4bfb429c981a7e234bd1a869f58f6342e4c88dcd84ad97edde' 
  AND token = 'rpKFUE+/sk2LMAvi/Fx3Tr3LWXQP1L9FgEI0SBkpaHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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