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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a4e026b037e85f745a13fdc7f3d403abb403cc880cd0d2e3eb574375747db3' 
  AND token = 'jWafA7wqHw3PLO5qVXWte25LIaoGMNLh4o1lTCDc2AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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